JPH0648639A - Sheet disorder preventing device - Google Patents

Abstract

PURPOSE:To prevent backward displacement of a sheet from being generated even when the sheet collides against a front stopper in a part of piling together the sheets. CONSTITUTION:A retaining roll 4 of mounting on the periphery an elastic unit 6 of rubber or the like, positioned in an outlet of a sheet piling up part, that is, in the downstream upward in an advancing direction of a sheet 2 not to rotate in a reverse direction by a reversing-preventive mechanism of ratchet wheel or the like but rotatable in the sheet advancing direction, is provided and also providing a control mechanism comprising air cylinders 5a, 5b or the like which can variably adjust pressing force against the sheet 2 successively input through the retaining roll 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet disturbance preventing device for aligning and stacking sheets such as corrugated board sheets, plastics, and thin steel sheets which are sequentially loaded through a conveyer or the like in a stacking section.

[0002]

2. Description of the Related Art FIG. 6 is an overall schematic structural view of a conventional general sheet stacking device, and FIG. 5 is an explanatory view of problems in the conventional sheet stacking device. Now, as shown in FIG. 6, the corrugated board web 9 continuously manufactured in the previous step is cut into several pieces along the traveling direction, and then cut off 10.
Is cut into a predetermined length to form a corrugated cardboard sheet 2, and is transferred via a cut-off exit conveyor 11 onto a shingling conveyor 3 operating at a slower speed than the conveyor 11 and stacked in a roof tile shape. Next, in the stacked state as described above, the sheets are sent through the conveyor 1 and are transferred one by one onto the sheet stacking table 8. The sheets 2 loaded on the table 8 come into contact with the front stopper 7 and fall downward to be stacked on the sheet stacking table 8. The upper end level of the sheets 2 stacked on the table 8 is detected by the photoelectric tube 12, and the elevation of the table 8 is controlled so that the drop H from the transport conveyor 1 becomes substantially constant. Reference numeral 13 in the drawing is a limit switch which is operated by lowering the table 8 to stop driving of the table 8 or the like. As described above, when the table 8 descends due to the stacking of the sheets 2 and reaches a predetermined amount, the limit switch 13 operates to stop the descending of the table 8 and the traveling of the conveyor 1 to stop the supply of the sheets 2. The bundle of sheets 2 stacked during this period is discharged to the outside and carried to the next step. Next, the table 8 is raised to the initial stacking position of the sheets and reset, and then the transport conveyor 1 is re-driven to start stacking the stacked sheets 2 on standby.

[0003]

The sheets 2 sequentially loaded as described above are pallets placed on the table 8 or stacked on the pallets at a predetermined speed and a drop H from the conveyor 1. Since it is thrown up to contact the front stopper 7, a considerable impinging force is generated on the front end, and the seat 2 is retracted due to the repulsive action force, which may cause a deviation from the front stopper 7. There was Further, the above-mentioned deviation amount greatly varies depending on various conditions such as the state of the sheet 2, for example, the mass of the sheet, the feeding speed, the head, the shingling state, and therefore, the stacked sheets are different from each other in the front-back direction and the forward-moving direction. There was a tendency to be greatly disturbed in the width direction. Moreover, fluctuations in the amount of deviation of the sheet (disturbance of the sheet) cause troubles such as collapse of the load when the sheet is discharged to the outside or damage to the sheet that is misaligned and jumped out. Is a major cause of reducing productivity as well as alienating labor saving.

As described above, the conventional sheet stacking unit regulates the position of the stacked sheets by merely bringing the sheets loaded from the conveyer into contact with the front stopper installed downstream and dropping and stacking the sheets. Since there is no means for aligning the sheets, the sheet tends to recede in the recoil after it collides with the front stopper. In addition, since the amount of the retreat deviation fluctuates arbitrarily according to various conditions such as the state of the loaded sheets, for example, the loading speed at which it contacts the front stopper, the angle, and the mass of the sheets, the stacked sheets vary greatly in the front-back direction. was there. Further, the stacking sheet (bundle) having the above-mentioned deviation has a drawback that it causes various troubles when it is carried out to the outside and causes various troubles, and requires a lot of manpower for the treatment (correction work). The present invention has been proposed to address the above conventional problems.

[0005]

Therefore, according to the present invention, there is provided a presser roll located above the exit of the sheet stacking portion (downstream side of the sheet advancing direction), rotatable in the sheet advancing direction and not rotating in the opposite direction. It is provided with a control mechanism capable of variably adjusting the pressing force applied to the sheets sequentially fed through the pressing roll, and the rubber for obtaining a high friction coefficient with respect to the sheet on the outer peripheral surface of the pressing roll. An elastic body such as the above is attached, and this is used as a means for solving the problem.

[0006]

According to the present invention, the sheets transferred through the conveyer conveyor and loaded into the sheet stacking unit are the uppermost stage of the stacked sheet bundle (the pallet placed on the sheet stacking table at the time of initial loading). While passing between the pressing rolls, the uppermost sheet slides and is guided by the rolling of the pressing rolls to contact the front stopper. Further, the backward shift due to the collision with the front stopper is restricted by the clamping of the outer peripheral surface of the pressing roll configured to prevent the reverse of the traveling speed of the sheet and the reverse rotation and the stacked front sheet. With this function, the sheets are sequentially stacked on the table with the front end side being surely aligned.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment of the present invention, and FIGS.
FIG. 3 is a schematic configuration explanatory view of a sheet disorder prevention device installed in a sheet stacking unit, and FIG. 3 is a functional explanatory diagram of the sheet disorder prevention device. The purpose of the present invention is to reliably align and stack the sheets 2 conveyed through the conveyer 1 in the stacking device which is the final step. The conveyer 1 and the shingling conveyer 3 reach the stacking section. The configuration and functions of the above are the same as those described in the conventional example.

In the present invention, as shown in the embodiment of FIGS. 1 and 2, the press roll 4 is disposed above the exit of the sheet stacking portion (downstream side in the sheet advancing direction). For example, the ratchet wheel 14 and the one-way clutch shown in FIG. 4 are incorporated so that the seat is horizontally stretched over the entire width of the seat and rotates in the seat advancing direction but does not rotate in the reverse direction (reverse direction). . In addition, a control mechanism that allows the pressing force to be variably set for the sheet 2 to be loaded is incorporated. In this embodiment, as one example, this control mechanism is a type in which both shaft ends of the presser roll 4 are pivotally supported by the head portions of the pair of air cylinders 5a and 5b. The front and rear sides of the cylinders 5a and 5b are the same. By appropriately controlling the air pressure to the sheet 2, the pressing force on the sheet 2 can be set arbitrarily. As the means for variably setting the pressing force, various mechanisms such as springs and balance weights can be provided in addition to the examples. The outer peripheral surface of the pressing roll 4 is covered with an elastic body 6 such as rubber in order to increase the coefficient of friction with the surface of the sheet 2 to be engaged. Further, as the structure of the pressing roll 4, the same shaft is commonly used in addition to the illustrated long rolls, or a plurality of short rolls are provided side by side through independent shafts with a predetermined gap. Different structures are possible. Also, as means for obtaining a high coefficient of friction, various structures are conceivable other than winding an elastic body such as rubber.

Next, the operation of the embodiment configured as described above will be described. The sheet 2 conveyed from the shingling conveyor 3 in the previous step through the conveyor 1 is put on the table 8 of the sheet stacking section. After that, the sheet passes through the middle of the uppermost sheet 2a of the stacked sheets and the pressing roll 4 and comes into contact with the front stopper 7 standing upright on the downstream side end to stop. The backward displacement of the sheet 2 caused by the collision of the sheet 2 with the front stopper 7 slows down the traveling speed of the sheet due to the contact resistance between the pressing roll 4 and the uppermost sheet 2a. Since the reverse rotation prevention mechanism such as the ratchet wheel 14 provided on the presser roll 4 almost restricts the shift to the backward side, the front end side may be stacked in a state of substantially contacting (proximity to) the front stopper 7. become. The pressing force of the presser roll 4 is controlled by adjusting the pressing force of the sheet stacking table 8 that is controlled to descend in accordance with the number of sheets (thickness) that are sequentially input and the air cylinders 5a and 5b that support the presser roll 4. It is kept almost constant. As described above, the present invention is configured and functions, so that the sheets 2 can be more reliably aligned in the sheet stacking unit. The present invention is shown in FIGS.
There are various methods other than those illustrated in the above, and the present invention is not limited to the embodiments shown in the drawings.

[0010]

As described in detail above, the present invention engages with the upper surface of a sheet which is positioned above the exit side of the sheet stacking section and allows the sheet to move in the advancing direction, and also in the backward direction. Since a presser roll that brakes the movement to the front is provided, it is possible to stop the sheets that are sequentially fed through the transport conveyor with the front end in contact with the front stopper, which causes a shift in the front-back direction when stacking the sheets ( Disturbance of sheets) can be prevented, and a sheet bundle in an aligned state can be obtained. Therefore, it is possible to solve the problem of load collapse in the post-process such as carrying out to the outside and other various troubles, and save labor and improve productivity.

[Brief description of drawings]

FIG. 1 is a side view of a sheet disorder prevention device provided in a sheet stacking device showing an embodiment of the present invention.

FIG. 2 is a view taken along arrows AA of FIG.

FIG. 3 is an explanatory diagram of a function of the sheet disorder prevention device of FIG. 1.

FIG. 4 is a detailed view of a B part in FIG.

FIG. 5 is a side view of a conventional sheet stacking device.

FIG. 6 is a side view showing an entire conventional sheet stacking device.

[Explanation of symbols]

 1 Transport Conveyor 2 Corrugated Cardboard Sheet (Sheet) 4 Presser Roll 5a, 5b Air Cylinder 6 Elastic Body 7 Front Stopper 8 Sheet Stacking Table 14 Claw Wheel

Claims (2)

[Claims] 1. A presser roll which is located above an exit (downstream side in the sheet advancing direction) of a sheet stacking portion, is rotatable in the sheet advancing direction, and is not rotatable in the opposite direction,
A sheet disturbance prevention device comprising a control mechanism capable of variably adjusting a pressing force applied to sheets sequentially input through the pressing roll. 2. The sheet disorder prevention device according to claim 1, wherein an elastic body such as rubber for obtaining a high friction coefficient with respect to the sheet is attached to an outer peripheral surface of the press roll.